html,
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans",
    "Droid Sans", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100%;
  background-color: #333;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
}

#canvas {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  margin: auto;
  user-select: none;
  width: 100%;
  height: 100%;
}

